Core for thread or yarn packages



ocr. 15, 1935. B, STOGNER 2,017,611

CORE FOR THREAD OR YARN PACKAGES Filed Nov. 44, 1933 Patented Oct. 15,1935 UNITED STATES PATENT OFFICE CORE FOR THREAD OR YARN PACKAGESLawrence B. Stogner, Hartsville, S. C., assignor .to Sonoco ProductsCompany, Hartsville, S. C.,

a corporation of South Carolina Application November 4, 1933, Serial No.696,734

2 Claims.

5 such windings, transportation of the same, and

nal unwinding upon a machine for the fabrication of cloth by knitting orweaving processes.

The invention contemplates the provision of a core of this type' whichis designed particularly for use in connection with winding machines. Insuch a machine a thread of great length, equal for instance to thecombined lengths of the threads wound upon a plurality of bobbins, isWound into the form of a relatively large cylindrical package, commonlyknown as a cheese During the winding of such package upon a core of thetype contemplated in the present invention, the core is supported forrevolution about its own axis upon a freely revoluble carrier member.When the package iscompleted or has reached the desired size, this core,with thread package thereon, is slipped off of the carrier and is readyfor transportation to a warping machine or other textile unit.

Heretofore thread cores of this general type have been fabricated ofmetal, bakelite, or other expensive materials, and it has not beendeemed commercially feasible to ship or transport thread packages frommill to mill owing to the relatively large investment in the coreitself, large numbers of which would necessarily have to be used witheach winding machine were the product of that machine shippedsubstantial distances. I-Ieretofore economy has required that thenumbers of cores used and each winding machine be minimized, land thisin turn has necessitated retention of the cores at the plant where thewinding opera-tions are carried out.

In accordance with the present invention, however, a thread core isprovided which may be produced at a minor fraction of the cost ofproduction of cores of the type heretofore used, which permits the use,with economy, of many more cores per winding machine, enabling theoperator of the machine to ship his thread windings or packages, dulymounted upon cores, for long distances. In fact thread cores of the typecontemplated by the present invention may be fabricated at such low costthat they may be used only once and thereafter discarded, thus making itpossible for .a knitter or weaver located at one point to buy threadpackages fabricated at a distant point and to furthermore hold in stockat his own plant any desired quantity of such packages, the cost of thecore adding only ,an insignicant amount to the cost of the package. thethread is unwound from the novel core, it may be discarded if desiredwithout appreciable loss.

In connection with plants having winding machines andralso provided withfabricating machines suiioient in number to utilize the entire output ofthe winding'machine, it may be economically advantageous to repeatedlyuse the thread cores, and wherever such reuse is to be practiced, l0

the paper cores contemplated by the present invention may be subjectedto a hardening process whereby the core is made stiffer and well able towith stand impacts which it necessarily meets with in such repeated use.

In addition to the great advantage of reduced cost, thereby permittingwider usage, the core in and of itself has many advantages over similardevices of the prior art. It is light in weight, being very considerablylighter than metal or bakelite cores of the type heretofore mostcommonly used. It furthermore possesses superior yarn retainingqualities whereby a thread or yarn package is caused to cling tightlythereto during both winding and unwinding operations and duringshipment. It is attractive in appearance and more convenient for themill operator to handle by reason of its lighter weight .and roughenedsurface. Still other advantages of the invention will be apparent tothose skilled in the art.

In the accompanying drawing, two forms of the improved core aredisclosed by way of example. It will be appreciated that in its minordetails the core may be considerably varied in designand construction inadapting the same to 35 winding machines of various types.

In the drawing:

Figure l is an axial section through one form of improved core, showingthe same to be mounted upon a revoluble holder of a winding machine andshowing a thread winding thereon;

Figure 2 is a side elevation of the same thread core, with packageremoved, partly broken away to show details of construction;

Figure 3 is an axial section through a slightly 45 modified type ofthread core constructed in ac cordance with the invention; and

Figure 4 is a section on line `4--4 of Figure 3. The member indicated atIll in Figure 1 of the drawing is the swinging arm oi. a windingmachine, and the cylindrical member l I comprises a holder for thethread core, this member being supported by the arm I0 for freerevolution about an axis normal to the arm. Elements I0 and Il justdescribed form no portion of the present After invention and may varyconsiderably in design and arrangement of parts. It may be said,however, that member II is provided with a thread core retaining devicewhich, in this instance, includes ball members I2 normally pressed bysprings (not illustrated) so as to project outwardly through aperturesI3 formed in the cylindrical surface of revoluble holder II. These ballAmembers in reality comprise yieldable detents adapted to interlock withthe thread core and to prevent accidental axial sliding movement of thethread core on member I I, but which members yield when any appreciableforce is exerted on the thread core tending to move it axially of the.holder I I and to thereby release the holder. A typical thread packageof the cylind drical type is indicated at I4.

The thread core shown in Figure 1 is also illustrated in Figure 2 but ingreater detail. It comprises an inner section, indicated generally atI5, and an outer cover, indicated at I6. The inner section is built upof a plurality of concentric paper cylinders secured together by asuitable adhesive so as to form a single, unitary, compact, andrelatively stiff and strong supporting cylinder. The paper of whichthese individual cylinders is fabricated, while not of high quality orgreat cost, is relatively dense and smooth so that the resultingcylinder has considerable mechanical strength. The cover I6 for theinner section of the core is preferably of relatively soft embossedpaper so that the inner windings of the thread package supported by thecore tend to cling to its surface.

While the core as thus far described may be fabricated by variousmethods, I prefer to form the inner section I5, which, as previouslyexplained, comprises a plurality of concentric cylinders securedtogether, by spirally winding a plurality of paper strips upon acylindrical mandrel, one upon the other, and thereafter severing therelatively long tube thus formed into proper core lengths. Each of thecylinders which come over the inner structure I5 may therefore be saidto comprise a single sheet of paper, the meeting edges of which abutalong a line spirally disposed with respect to the axis of the core. Theseveral sheets are so arranged that the joint between the edges of eachis covered by an unbroken surface on the next adjacent sheet, thismethod of breaking joints insuring that the inner structure has amaximum strength for the weight of paper employed in its construction.The outer layer I6 of paper is applied immediately after the formationof the inner structure' and is wound convolutely instead of spirally,its edges meeting along a line parallel to the axis of the core.Preferably the meeting edges of the paper sheet I5 are mutuallychamfered or beveled so that no ridge is formed along the line of-meeting After the application of the covering sheet I6, the paper coreis subjected to two further operations. In one operation it is revolvedrelatively to a tool insertedin its interior, which exerts a veryconsiderable outward pressure against the .inner surface of the core,this relative rotation of tool and core continuing until a verysubstantial groove, indicated at I'I, is formed interiorly thereof, thepaper body displaced in the formation of the groove appearing exteriorlyof the otherwise cylindrical exterior surface of the core so as to forma rib I8. One annular end of the core is then upsetY or deformed,preferably by pressing the end surface against an annularly grooved andrapidly rotating die. this operation being continued until the end ofthe core is deflected in wardly as shown in Figures 1 and 2, the endsurface I9 being preferably turned to lie in a plane transverse of theaxis of the core, as shown.

When in use, the inturned end of the core con- 5 stitutes a means notonly for insuring that the core is applied to the holder II by movementin one direction only, but it also constitutes a stop limiting themovement of the core onto the holder and thereby preventing the oppositeend of the 10 l core from coming in contact with the arm Il) which wouldnaturally frictionally retard rotation of the holder relatively to thearm. The provision of a stop such as indicated also insures that thecore will be so positioned on the holder 15 that the retaining membersI2 will exactly engage within groove I1.

In the manufacture of the form of spool disclosed in Figures 3 and 4 ofthe drawing, substantially the same series of operations are car- 20ried out. An interior structure comprising a series of -concentric papercylinders is indicated at 20, and a covering sheet of roughened orembossed paper, indicated at 2l, is aiiixed thereto. In the case of thiscore, however, no external rib 35 is formed, the groove 22 being formedeither by simply compressing the paper by a suitable tool or by removinga portion of the same by a grinding tool. In addition a plurality ofcircular holes, one of which is indicated at 23, are formed in the 3Qwall of the core, these holes opening into the bottom of the groove 22.The spring-pressed members I2 may enter these holes when the core isplaced upon a holder such as II, thus providing additional interlockbetween the core and holder. 3,5 Instead of inturning the end of thecore as in the case of the invention first described, minor sections ofthe same adjacent one end are displaced by stamping or punchingoperations, four interiorly projecting tabs or deformed portions 24 be-40 ing thereby formed. The inner edge surfaces 24 of these portions 24comprise abutment surfaces which strike the outer end of holder II whenthe core is placed on the holder, thus limiting its movement andinsuring proper interlocking of 45 the detents I2 with the core andpreventing the end of the core from striking the arm I0.

As has been before explained, cores fabricated in accordance with theinvention may be subjected, if desired, to the action of a hardening 50compound; for instance, they may be impregnated with sulphur after beingotherwise completely formed and, when'so treated, attain great hardness,thus enabling them to be used many times. If, however, the novel papercoresare 55 intended for a single use only, as where it is intended thatthey shall be shipped with thread packages thereon from one plant to adistant plant, hardening in this manner is quite unnecessary, apapercore formed as described being well 60 able to withstand the impactand shock incident to transportation without damage. By placing thesurface covering on the inner structure as a convolute winding, it actsas a substantial retaining layer for the outer paper cylinder of theinner structure, preventing loosening of the tapering corners of thesheet which comprises this layer. Were the covering sheet I5 omitted,one or other of the pointed ends of the spirally formed 70 outer layerof the inner structure might become loosened in use, thus providing anupward projection which might be caught by the thread with resultingdamage or breakage to the thread.

Having thus described the invention, what is 7,5

claimed as new and desired to be secured by Let- 2. A cylindrical papercore having a groove ters Patent is: formed interiorly thereof, in atrnsverse plane,

1. A cylindrical paper core for a yarn packand a plurality of aperturesforrned in the bottom r age having spaced inwardly distorted portions ofsaid groove and extending through 'the wall adjacent one end thereof,said portions comprisof the core.

ing stop means to limit the movement of the core LAWRENCE B. STOGNER.onto a. cylindrical core holder.

